Speed-changing device for motors.



G. W. FOWLER & W. P. S IEBENMORGEN. SPEED CHANGING DEVICE FOR MOTORS.

APPLICATION FILED MAR. 16, 1908.

952,033. Patented Mar. 15,1910. R

ANDREW B GRAHAM co, FNOTO-UTNUGRAFNER5 wAsmuaTou o. c.

M, 1 I I nisrrnn STATEd Parana carton,

GEORGE V]. FOWLER AND WILLIAIVI P. SIEBENMORGEN, OF \VESTFIELD, NEWJERSEY.

SPEED-CHANGING DEVICE FOR lKOTORS.

Specification of Letters Patent.

Patented Mar. 15, 1910.

To (all whom it may concern:

Be it known that we, GEORGE XV. FOWLER and lVILLIAM P. SIEBENMORGEN,citizens of the United States, and residents of the town of Nestfield,Union county, and State of New Jersey, have invented certain new anduseful Improvements in Speed-Changing Devices for Motors, of which thefollowing is a specification.

The object of this invention is to provide an improved form of variablespeed gearing, designed particularly for portable motors.

The invention comprises the various new features of construction andcombinations of parts described and illustrated, and more particularlypointed out in the claims.

In the drawings, Figure 1 is a vertical, longitudinal section through amotor embodying the improved gearing, and Fig. 2 is a sectional detail.

Referring to these drawings, 1 indicates a suitable casing, preferablyhorizontally elongated, for the motor. This casing is shown as supportedhorizontally by a removable base 2, secured in place by screws 3. Theends of the casing may be tapped, as at 5, to permit the base to besecured thereto, to hold the casing in an upright position; the dottedlines at 6 indicating how a spacing member may be inserted between thebase and casing.

7 is the field, and 8 the armature within the casing.

A handle 11 or a hanger may be screwed in tapped openings 12.

9 is the armature shaft, which is shown as journaled in and projectingthrough one end of the casing. This end of the shaft may be utilized fordriving various tools and mechanisms at high speed, in the drawing, agrinding or polishing wheel 10 being shown mounted removably thereon.Toward the other end of the shaft 9 is secured a friction disk 13.Opposed to this disk is a pinion 14, the hub of which, 15, is journaledin a bushing 17 in the adjacent end of the casing, said hub, itself,serving as a. bearing for the adjacent end of the shaft 9. Pinion 14Lmeshes with a pinion 16, which is mounted on a stub shaft 18,conveniently screwed into the adjacent end of the casing. Fixed on thehub of pinion 16, or otherwise made rigid therewith is a second frictiondisk 19.

Between the opposed faces of the two friction disks is a friction roller20. In the position shown in the drawing, this roller is below theperiphery of the disk 19 and opposite a central dished region 21 in theface of the disk 13; so that motion is not communicated from one disk tothe other. The roller 20, however, may be caused to connect the twodisks, by means of its shaft 22, which is shown as extending verticallyupward and threaded through a sleeve 23, mounted in an opening 24- inthe top of the casing. By screwing the shaft upward the roller 20 iscaused to engage with both friction surfaces; and the speed may bevaried by adjusting the roller up and down. A lock nut 25 may beprovided to secure the shaft in any of its adjusted positions.

In order to provide for holding the friction surfaces in yieldingcontact, I have shown a spring 26, secured to the casing, and bearingagainst a thrust bearing 27, so as to tend to hold the pinion 16 andfriction disk 19 against the head 28 of the stub shaft 18. This head 28has a vertical slot extending inward from its end face, for the loosereception of the shaft 22; the object of this construction being toprevent the roller 20 from swinging across the faces of the frictiondisks 13 and 19. Slight movement of the roller 20 in a plane normal tothe friction surfaces of the disks is, however, permitted by pivots 29,which are shown as being screwed through a. flange 30 of the casing, ingeneral parallelism to the friction surfaces of the disks 13 and 19, andbearing against notches in the sleeve 23.

The hub 15 extends through the adjacent end of the casing, andconstitutes the variable speed shaft. Power may be taken from it bymeans of the grooves 31, on which may also be mounted various toolsormechanism; or by means of a cone pulley 32 secured in place by a setscrew 33.

In addition to the construction of the variable speed gearing, applicantdesires to point out as novel with him, the design of a motor, oneprojection of whose armature shaft serves as a high speed shaft rotatingat constant speed, while the other projection of the armature shaft isconnected with a low speed shaft by means of a variable speed reducinggearing. This style of motor is applicable for a very wide range ofusefulness, some of the applications being: portable or stationarygrinder, buffer and polisher, portable hand or breast drill, stationarydrill, dental lathe work,

jewelers work, automatic pianos, banjos, phonographs, picture machines,advertising novelties, sign flashers, sewing machine drive, air pumps,coffee mills, ice-cream freezers, dough mixers, bread kneaders, washingmachines, hair clippers, fans, blowers, exhausters, ceiling fans, bottlecleaners, paint scrubbers, cloth cutter, etc.

A. further feature of novelty, to which particular attention is drawn,is the arrangement of the high and low speed shafts in alinement, thelow speed. shaft, or an cX- tension thereof, serving as a bearing forthe high speed shaft.

lVhat we claim as new is:

1. A gearing, comprising a driving shaft, a friction disk thereon, anidler shaft to one side of the driving shaft, a friction disk slidablymounted on said idler shaft, a gear also on said idler shaft and securedto the second friction disk, a driven shaft positioned in alinementwithsaid driving shaft, a gear thereon engaging with the first named gear,and a friction roller adjustable between the opposed portions of thefaces of said friction disks.

2. A speed changing device comprising in its construction a drivingshaft, a frietion disk carried by said driving shaft, a driven shaftpositioned in alinement with said driving shaft, a stationary idlershaft, a rotatable friction disk carried by said idler shaft, a frictionroller operativelv engaging said friction disks, means for holding thefriction surfaces in yielding contact, and means for transmitting themove ment of said last named friction disk to said driven shaft.

8. A gearing, comprising a driving shaft, a driven shaft. serving as abearing for the driving shaft, a friction disk on the driving shaft, anidler shaft to one side of the two shafts, a second friction disk onsaid idler shaft, a gear also on said idler shaft and secured to thesecond friction disk, a gear on the driven shaft engaging the firstnamedgear, and a friction roller adjustable between the two friction disks.

j said last named 4t. A friction gearing, com irising opposed frictiondisks, a shaft between said disks, a friction roller carried by saidshaft, a pivotal support for said shaft constructed to permitoscillation of the latter in a plane normal to the faces of the disks,and a slotted guide member for preventing oscillation of said shaftparallel to the disk faces.

in a friction gearing, the combination of a casing or support, opposedfriction disks, a depending shaft between said disks, a friction rollercarried by said shaft, a sleeve into which the upper portion of theshaft is threaded to permit adjustment of the roller radially of thedisks, and means pivoting said sleeve to the casing on. an axis generallparallel to the opposed faces of the friction disks.

6. A casing, a motor mounted therein and having one end of its armatureshaft projecting outside of said casing and arranged for direct driving,a projecting shaft forming an extension of the opposite end of saidarmature shaft, and a variable speed ducing geaii'ing connecting saidshafts.

4. A casing, a motor mounted therein and havin one end of its armatureshaft nroa a D I n I ecting outside of sand casing and arranged fordirect driving, a projecting shaft forming an extension of the oppositeend of said armature shaft, a friction disk mounted on said armatureshaft, an intermediate shaft mounted within said casing, a secondfriction disk carried by said intermediate shaft, a friction rolleradjustably mounted with relation to said friction disks, a. pinionoperated by said second friction disk, and a gear meshin with saidpinion and carried by projecting shaft.

Signed at New York city in the county of New York and State of New York,this 4th da of March 1908.

GEORGE W. FOWLER. M. P. SIEBENBIIORGEN. Witnesses PAMELIA VJ. VONP121211, J. O. FREDERIOKS.

